+    @unittest.skipIf(sysconfig.get_config_var('ANDROID_API_LEVEL') == 0,
+                         "not an android platform")
+    def test_is_android(self):
+        # Use an heuristic, the shell on Android is at /system/bin/sh.
+        proc = subprocess.run(['/system/bin/sh', '-c', 'echo OK'],
+                              stdout=subprocess.PIPE)
+        self.assertIn(b'OK', proc.stdout)

I dislike such functional test, it might fail and might need maintaince.

I suggest to push the change without the unit test.